991290 has 32 divisors (see below), whose sum is σ = 2405376. Its totient is φ = 261440.

The previous prime is 991273. The next prime is 991313. The reversal of 991290 is 92199.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5095 + ... + 5285.

It is an arithmetic number, because the mean of its divisors is an integer number (75168).

2⁹⁹¹²⁹⁰ is an apocalyptic number.

991290 is an abundant number, since it is smaller than the sum of its proper divisors (1414086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991290 is a wasteful number, since it uses less digits than its factorization.

991290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 991290 is about 995.6354754628. The cubic root of 991290 is about 99.7088196295.

The spelling of 991290 in words is "nine hundred ninety-one thousand, two hundred ninety".